You have to worry about the pressure drop across the throttle body, then across the air filter, then from the air filter to outside air. The inlet needs to be larger than the throttle body itself, and the further away the inlet is from the throttle body is, the larger the opening needs to be.

 

So so these new 103 motors have the same cam as the 96's?

 

I have a 2010 Softail ConV (110) and a 2012 Dyna Switchback (103) and both have a Stage 1 and have been dyno'd. Helps the bike run cooler.

 

Engines with a catalityc converter (like modern HD engines) run as close as stoichiometric ratio as possible, otherwise the catalyzer gets damaged.
They run lean only on the release phase, where the engine load is very low and it's safe to do so.
They run 14,7 on steady throttle and run rich when accelerating, both to cool down engine chamber and to protect engine against pinging.

 

thanks

 

One of the more informative Stage One and motor discussions of the 103 that I've read on this forum!

I have done a Stage One on the RKC 103 and it reduced the heat emitted onto the right side and my lap considerably!

The heat now goes down the ceramic coated head pipes to the Jackpot 4.5 inch mufflers very well.

As to performance, yes, I can feel a difference. But until it goes on to a dyno, it's only 'in my head and in my ears'... which do hear a more 'pronounced and stronger' tone from the motor/mufflers.

 

As one example: The Air Cleaner used on Carbureted applications, such as my 2003 Low Rider, that also had the Vapor Canister (California), presented a significant restriction. In the attached pictures you can see how the Air Cleaner has a hinged "Door" at the inlet to the Air Cleaner. This purpose of the "Door" is to prevent Hydrocarbon vapor (unburned gasoline) that evaporates from the Carburetor when the engine is off, from escaping to the atmosphere. When the engine is restarted the Hydrocarbon/Fuel vapors that were trapped in the Air Cleaner Housing behind the "Door" get sucked into the engine and are burned. This usually represents about 20% or more of the total Hydrocarbon emissions from a non-fuel injected engine. This is just one reason manufacturers like fuel injection; because fuel injection systems don't have fuel vapor leaky carburetors to even begin to worry about. Anyhow, this "Door" can hardly be thought of as a performance advantage even if it does reduce the Hydrocarbon emissions of the bike. All that said; If I were in the business of selling aftermarket Air Cleaners I would be darn sure to compare my Replacement Air Cleaner to this Original Equipment Air Cleaner. I mean, how could I possibly loose? When you see an ad that says "Up to . . . " XXX Power increase I suspect that they are referring to replacing this "Door" style Air Cleaner with theirs.

 

Hey, I was just wondering if you have an answer to your question?

 

ditto, my 2011 RKC was ballsy stock, started sounding good & a little beefier after about 500 miles or so, but I had to open it up air wise, less restriction with catless header pipe (BUB 7 TDX system) and Arlen Ness 'BIG SUCKER a/c, and wide band PV tuner, and now the King is...

 

a trap door air filter assembly. what will they think of next? it is easy to understand why you have to re-jet or retune after replacing a/c or pipes. has there been a test using different a/c to see which one flows the best, or do you reach a point where you just can't flow anymore air because of the size of the throttle body?